X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fobdclass%2Fgenops.c;h=f4950842f6f556938c65adedaecbb9e9951a2c84;hp=25d12e41910cb4a72ebf4184bc3b6a8d708e96c2;hb=35dc2e39288f15abab2d6bf7bb3f572d9670521c;hpb=3192e52a89946f12fd36d28a686c169d01d36e64 diff --git a/lustre/obdclass/genops.c b/lustre/obdclass/genops.c index 25d12e4..f495084 100644 --- a/lustre/obdclass/genops.c +++ b/lustre/obdclass/genops.c @@ -1,25 +1,39 @@ -/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- - * vim:expandtab:shiftwidth=8:tabstop=8: +/* + * GPL HEADER START + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * - * Copyright (c) 2001-2003 Cluster File Systems, Inc. + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. * - * This file is part of the Lustre file system, http://www.lustre.org - * Lustre is a trademark of Cluster File Systems, Inc. + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). * - * You may have signed or agreed to another license before downloading - * this software. If so, you are bound by the terms and conditions - * of that agreement, and the following does not apply to you. See the - * LICENSE file included with this distribution for more information. + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf * - * If you did not agree to a different license, then this copy of Lustre - * is open source software; you can redistribute it and/or modify it - * under the terms of version 2 of the GNU General Public License as - * published by the Free Software Foundation. + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. * - * In either case, Lustre is distributed in the hope that it will be - * useful, but WITHOUT ANY WARRANTY; without even the implied warranty - * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * license text for more details. + * GPL HEADER END + */ +/* + * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. + * + * Copyright (c) 2011, 2012, Whamcloud, Inc. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. + * + * lustre/obdclass/genops.c * * These are the only exported functions, they provide some generic * infrastructure for managing object devices @@ -32,9 +46,8 @@ #include #include #include -#include -extern struct list_head obd_types; +extern cfs_list_t obd_types; spinlock_t obd_types_lock; cfs_mem_cache_t *obd_device_cachep; @@ -42,14 +55,17 @@ cfs_mem_cache_t *obdo_cachep; EXPORT_SYMBOL(obdo_cachep); cfs_mem_cache_t *import_cachep; -struct list_head obd_zombie_imports; -struct list_head obd_zombie_exports; -spinlock_t obd_zombie_impexp_lock; -void (*obd_zombie_impexp_notify)(void) = NULL; -EXPORT_SYMBOL(obd_zombie_impexp_notify); - +cfs_list_t obd_zombie_imports; +cfs_list_t obd_zombie_exports; +spinlock_t obd_zombie_impexp_lock; +static void obd_zombie_impexp_notify(void); +static void obd_zombie_export_add(struct obd_export *exp); +static void obd_zombie_import_add(struct obd_import *imp); +static void print_export_data(struct obd_export *exp, + const char *status, int locks); int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c); +EXPORT_SYMBOL(ptlrpc_put_connection_superhack); /* * support functions: we could use inter-module communication, but this @@ -59,48 +75,60 @@ static struct obd_device *obd_device_alloc(void) { struct obd_device *obd; - OBD_SLAB_ALLOC_PTR(obd, obd_device_cachep); + OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, CFS_ALLOC_IO); if (obd != NULL) { obd->obd_magic = OBD_DEVICE_MAGIC; } return obd; } -EXPORT_SYMBOL(obd_device_alloc); static void obd_device_free(struct obd_device *obd) { LASSERT(obd != NULL); - LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n", + LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n", obd, obd->obd_magic, OBD_DEVICE_MAGIC); + if (obd->obd_namespace != NULL) { + CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n", + obd, obd->obd_namespace, obd->obd_force); + LBUG(); + } + lu_ref_fini(&obd->obd_reference); OBD_SLAB_FREE_PTR(obd, obd_device_cachep); } -EXPORT_SYMBOL(obd_device_free); struct obd_type *class_search_type(const char *name) { - struct list_head *tmp; - struct obd_type *type; - - spin_lock(&obd_types_lock); - list_for_each(tmp, &obd_types) { - type = list_entry(tmp, struct obd_type, typ_chain); - if (strcmp(type->typ_name, name) == 0) { - spin_unlock(&obd_types_lock); - return type; - } - } - spin_unlock(&obd_types_lock); - return NULL; + cfs_list_t *tmp; + struct obd_type *type; + + spin_lock(&obd_types_lock); + cfs_list_for_each(tmp, &obd_types) { + type = cfs_list_entry(tmp, struct obd_type, typ_chain); + if (strcmp(type->typ_name, name) == 0) { + spin_unlock(&obd_types_lock); + return type; + } + } + spin_unlock(&obd_types_lock); + return NULL; } +EXPORT_SYMBOL(class_search_type); struct obd_type *class_get_type(const char *name) { struct obd_type *type = class_search_type(name); -#ifdef CONFIG_KMOD +#ifdef HAVE_MODULE_LOADING_SUPPORT if (!type) { const char *modname = name; - if (!request_module(modname)) { + + if (strcmp(modname, "obdfilter") == 0) + modname = "ofd"; + + if (!strncmp(modname, LUSTRE_MDS_NAME, strlen(LUSTRE_MDS_NAME))) + modname = LUSTRE_MDT_NAME; + + if (!cfs_request_module("%s", modname)) { CDEBUG(D_INFO, "Loaded module '%s'\n", modname); type = class_search_type(name); } else { @@ -110,27 +138,29 @@ struct obd_type *class_get_type(const char *name) } #endif if (type) { - spin_lock(&type->obd_type_lock); - type->typ_refcnt++; - try_module_get(type->typ_dt_ops->o_owner); - spin_unlock(&type->obd_type_lock); - } - return type; + spin_lock(&type->obd_type_lock); + type->typ_refcnt++; + cfs_try_module_get(type->typ_dt_ops->o_owner); + spin_unlock(&type->obd_type_lock); + } + return type; } +EXPORT_SYMBOL(class_get_type); void class_put_type(struct obd_type *type) { - LASSERT(type); - spin_lock(&type->obd_type_lock); - type->typ_refcnt--; - module_put(type->typ_dt_ops->o_owner); - spin_unlock(&type->obd_type_lock); + LASSERT(type); + spin_lock(&type->obd_type_lock); + type->typ_refcnt--; + cfs_module_put(type->typ_dt_ops->o_owner); + spin_unlock(&type->obd_type_lock); } +EXPORT_SYMBOL(class_put_type); #define CLASS_MAX_NAME 1024 -int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops, - struct lprocfs_vars *vars, const char *name, +int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops, + struct lprocfs_vars *vars, const char *name, struct lu_device_type *ldt) { struct obd_type *type; @@ -153,9 +183,9 @@ int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops, OBD_ALLOC_PTR(type->typ_dt_ops); OBD_ALLOC_PTR(type->typ_md_ops); OBD_ALLOC(type->typ_name, strlen(name) + 1); - - if (type->typ_dt_ops == NULL || - type->typ_md_ops == NULL || + + if (type->typ_dt_ops == NULL || + type->typ_md_ops == NULL || type->typ_name == NULL) GOTO (failed, rc); @@ -164,7 +194,7 @@ int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops, if (md_ops) *(type->typ_md_ops) = *md_ops; strcpy(type->typ_name, name); - spin_lock_init(&type->obd_type_lock); + spin_lock_init(&type->obd_type_lock); #ifdef LPROCFS type->typ_procroot = lprocfs_register(type->typ_name, proc_lustre_root, @@ -177,14 +207,14 @@ int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops, #endif if (ldt != NULL) { type->typ_lu = ldt; - rc = ldt->ldt_ops->ldto_init(ldt); + rc = lu_device_type_init(ldt); if (rc != 0) GOTO (failed, rc); } - spin_lock(&obd_types_lock); - list_add(&type->typ_chain, &obd_types); - spin_unlock(&obd_types_lock); + spin_lock(&obd_types_lock); + cfs_list_add(&type->typ_chain, &obd_types); + spin_unlock(&obd_types_lock); RETURN (0); @@ -198,6 +228,7 @@ int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops, OBD_FREE(type, sizeof(*type)); RETURN(rc); } +EXPORT_SYMBOL(class_register_type); int class_unregister_type(const char *name) { @@ -218,16 +249,18 @@ int class_unregister_type(const char *name) RETURN(-EBUSY); } - if (type->typ_procroot) { - lprocfs_remove(&type->typ_procroot); - } + /* we do not use type->typ_procroot as for compatibility purposes + * other modules can share names (i.e. lod can use lov entry). so + * we can't reference pointer as it can get invalided when another + * module removes the entry */ + lprocfs_try_remove_proc_entry(type->typ_name, proc_lustre_root); if (type->typ_lu) - type->typ_lu->ldt_ops->ldto_fini(type->typ_lu); + lu_device_type_fini(type->typ_lu); - spin_lock(&obd_types_lock); - list_del(&type->typ_chain); - spin_unlock(&obd_types_lock); + spin_lock(&obd_types_lock); + cfs_list_del(&type->typ_chain); + spin_unlock(&obd_types_lock); OBD_FREE(type->typ_name, strlen(name) + 1); if (type->typ_dt_ops != NULL) OBD_FREE_PTR(type->typ_dt_ops); @@ -236,7 +269,19 @@ int class_unregister_type(const char *name) OBD_FREE(type, sizeof(*type)); RETURN(0); } /* class_unregister_type */ +EXPORT_SYMBOL(class_unregister_type); +/** + * Create a new obd device. + * + * Find an empty slot in ::obd_devs[], create a new obd device in it. + * + * \param[in] type_name obd device type string. + * \param[in] name obd device name. + * + * \retval NULL if create fails, otherwise return the obd device + * pointer created. + */ struct obd_device *class_newdev(const char *type_name, const char *name) { struct obd_device *result = NULL; @@ -244,31 +289,33 @@ struct obd_device *class_newdev(const char *type_name, const char *name) struct obd_type *type = NULL; int i; int new_obd_minor = 0; + ENTRY; - if (strlen(name) > MAX_OBD_NAME) { + if (strlen(name) >= MAX_OBD_NAME) { CERROR("name/uuid must be < %u bytes long\n", MAX_OBD_NAME); RETURN(ERR_PTR(-EINVAL)); } - type = class_get_type(type_name); + type = class_get_type(type_name); if (type == NULL){ CERROR("OBD: unknown type: %s\n", type_name); RETURN(ERR_PTR(-ENODEV)); } newdev = obd_device_alloc(); - if (newdev == NULL) { - class_put_type(type); - RETURN(ERR_PTR(-ENOMEM)); - } + if (newdev == NULL) + GOTO(out_type, result = ERR_PTR(-ENOMEM)); + LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC); - spin_lock(&obd_dev_lock); + write_lock(&obd_dev_lock); for (i = 0; i < class_devno_max(); i++) { struct obd_device *obd = class_num2obd(i); + if (obd && obd->obd_name && (strcmp(name, obd->obd_name) == 0)) { - CERROR("Device %s already exists, won't add\n", name); + CERROR("Device %s already exists at %d, won't add\n", + name, i); if (result) { LASSERTF(result->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n", result, @@ -288,26 +335,31 @@ struct obd_device *class_newdev(const char *type_name, const char *name) result->obd_minor = i; new_obd_minor = i; result->obd_type = type; - memcpy(result->obd_name, name, strlen(name)); + strncpy(result->obd_name, name, + sizeof(result->obd_name) - 1); obd_devs[i] = result; } } - spin_unlock(&obd_dev_lock); - + write_unlock(&obd_dev_lock); + if (result == NULL && i >= class_devno_max()) { CERROR("all %u OBD devices used, increase MAX_OBD_DEVICES\n", class_devno_max()); - result = ERR_PTR(-EOVERFLOW); + GOTO(out, result = ERR_PTR(-EOVERFLOW)); } - - if (IS_ERR(result)) { - obd_device_free(newdev); - class_put_type(type); - } else { - CDEBUG(D_IOCTL, "Adding new device %s (%p)\n", - result->obd_name, result); - } - return result; + + if (IS_ERR(result)) + GOTO(out, result); + + CDEBUG(D_IOCTL, "Adding new device %s (%p)\n", + result->obd_name, result); + + RETURN(result); +out: + obd_device_free(newdev); +out_type: + class_put_type(type); + return result; } void class_release_dev(struct obd_device *obd) @@ -320,12 +372,12 @@ void class_release_dev(struct obd_device *obd) obd, obd->obd_minor, obd_devs[obd->obd_minor]); LASSERT(obd_type != NULL); - CDEBUG(D_INFO, "Release obd device %s obd_type name =%s\n", - obd->obd_name,obd->obd_type->typ_name); + CDEBUG(D_INFO, "Release obd device %s at %d obd_type name =%s\n", + obd->obd_name, obd->obd_minor, obd->obd_type->typ_name); - spin_lock(&obd_dev_lock); + write_lock(&obd_dev_lock); obd_devs[obd->obd_minor] = NULL; - spin_unlock(&obd_dev_lock); + write_unlock(&obd_dev_lock); obd_device_free(obd); class_put_type(obd_type); @@ -338,24 +390,26 @@ int class_name2dev(const char *name) if (!name) return -1; - spin_lock(&obd_dev_lock); + read_lock(&obd_dev_lock); for (i = 0; i < class_devno_max(); i++) { struct obd_device *obd = class_num2obd(i); + if (obd && obd->obd_name && strcmp(name, obd->obd_name) == 0) { /* Make sure we finished attaching before we give out any references */ LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC); if (obd->obd_attached) { - spin_unlock(&obd_dev_lock); + read_unlock(&obd_dev_lock); return i; } break; } } - spin_unlock(&obd_dev_lock); + read_unlock(&obd_dev_lock); return -1; } +EXPORT_SYMBOL(class_name2dev); struct obd_device *class_name2obd(const char *name) { @@ -365,24 +419,27 @@ struct obd_device *class_name2obd(const char *name) return NULL; return class_num2obd(dev); } +EXPORT_SYMBOL(class_name2obd); int class_uuid2dev(struct obd_uuid *uuid) { int i; - spin_lock(&obd_dev_lock); + read_lock(&obd_dev_lock); for (i = 0; i < class_devno_max(); i++) { struct obd_device *obd = class_num2obd(i); + if (obd && obd_uuid_equals(uuid, &obd->obd_uuid)) { LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC); - spin_unlock(&obd_dev_lock); + read_unlock(&obd_dev_lock); return i; } } - spin_unlock(&obd_dev_lock); + read_unlock(&obd_dev_lock); return -1; } +EXPORT_SYMBOL(class_uuid2dev); struct obd_device *class_uuid2obd(struct obd_uuid *uuid) { @@ -391,16 +448,24 @@ struct obd_device *class_uuid2obd(struct obd_uuid *uuid) return NULL; return class_num2obd(dev); } +EXPORT_SYMBOL(class_uuid2obd); +/** + * Get obd device from ::obd_devs[] + * + * \param num [in] array index + * + * \retval NULL if ::obd_devs[\a num] does not contains an obd device + * otherwise return the obd device there. + */ struct obd_device *class_num2obd(int num) { struct obd_device *obd = NULL; if (num < class_devno_max()) { obd = obd_devs[num]; - if (obd == NULL) { + if (obd == NULL) return NULL; - } LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n", @@ -412,15 +477,17 @@ struct obd_device *class_num2obd(int num) return obd; } +EXPORT_SYMBOL(class_num2obd); void class_obd_list(void) { char *status; int i; - spin_lock(&obd_dev_lock); + read_lock(&obd_dev_lock); for (i = 0; i < class_devno_max(); i++) { struct obd_device *obd = class_num2obd(i); + if (obd == NULL) continue; if (obd->obd_stopping) @@ -434,9 +501,9 @@ void class_obd_list(void) LCONSOLE(D_CONFIG, "%3d %s %s %s %s %d\n", i, status, obd->obd_type->typ_name, obd->obd_name, obd->obd_uuid.uuid, - atomic_read(&obd->obd_refcount)); + cfs_atomic_read(&obd->obd_refcount)); } - spin_unlock(&obd_dev_lock); + read_unlock(&obd_dev_lock); return; } @@ -449,9 +516,10 @@ struct obd_device * class_find_client_obd(struct obd_uuid *tgt_uuid, { int i; - spin_lock(&obd_dev_lock); + read_lock(&obd_dev_lock); for (i = 0; i < class_devno_max(); i++) { struct obd_device *obd = class_num2obd(i); + if (obd == NULL) continue; if ((strncmp(obd->obd_type->typ_name, typ_name, @@ -460,27 +528,16 @@ struct obd_device * class_find_client_obd(struct obd_uuid *tgt_uuid, &obd->u.cli.cl_target_uuid) && ((grp_uuid)? obd_uuid_equals(grp_uuid, &obd->obd_uuid) : 1)) { - spin_unlock(&obd_dev_lock); + read_unlock(&obd_dev_lock); return obd; } } } - spin_unlock(&obd_dev_lock); + read_unlock(&obd_dev_lock); return NULL; } - -struct obd_device *class_find_client_notype(struct obd_uuid *tgt_uuid, - struct obd_uuid *grp_uuid) -{ - struct obd_device *obd; - - obd = class_find_client_obd(tgt_uuid, LUSTRE_MDC_NAME, NULL); - if (!obd) - obd = class_find_client_obd(tgt_uuid, LUSTRE_OSC_NAME, - grp_uuid); - return obd; -} +EXPORT_SYMBOL(class_find_client_obd); /* Iterate the obd_device list looking devices have grp_uuid. Start searching at *next, and if a device is found, the next index to look @@ -497,23 +554,68 @@ struct obd_device * class_devices_in_group(struct obd_uuid *grp_uuid, int *next) else return NULL; - spin_lock(&obd_dev_lock); + read_lock(&obd_dev_lock); for (; i < class_devno_max(); i++) { struct obd_device *obd = class_num2obd(i); + if (obd == NULL) continue; if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) { if (next != NULL) *next = i+1; - spin_unlock(&obd_dev_lock); + read_unlock(&obd_dev_lock); return obd; } } - spin_unlock(&obd_dev_lock); + read_unlock(&obd_dev_lock); return NULL; } +EXPORT_SYMBOL(class_devices_in_group); + +/** + * to notify sptlrpc log for \a fsname has changed, let every relevant OBD + * adjust sptlrpc settings accordingly. + */ +int class_notify_sptlrpc_conf(const char *fsname, int namelen) +{ + struct obd_device *obd; + const char *type; + int i, rc = 0, rc2; + + LASSERT(namelen > 0); + read_lock(&obd_dev_lock); + for (i = 0; i < class_devno_max(); i++) { + obd = class_num2obd(i); + + if (obd == NULL || obd->obd_set_up == 0 || obd->obd_stopping) + continue; + + /* only notify mdc, osc, mdt, ost */ + type = obd->obd_type->typ_name; + if (strcmp(type, LUSTRE_MDC_NAME) != 0 && + strcmp(type, LUSTRE_OSC_NAME) != 0 && + strcmp(type, LUSTRE_MDT_NAME) != 0 && + strcmp(type, LUSTRE_OST_NAME) != 0) + continue; + + if (strncmp(obd->obd_name, fsname, namelen)) + continue; + + class_incref(obd, __FUNCTION__, obd); + read_unlock(&obd_dev_lock); + rc2 = obd_set_info_async(NULL, obd->obd_self_export, + sizeof(KEY_SPTLRPC_CONF), + KEY_SPTLRPC_CONF, 0, NULL, NULL); + rc = rc ? rc : rc2; + class_decref(obd, __FUNCTION__, obd); + read_lock(&obd_dev_lock); + } + read_unlock(&obd_dev_lock); + return rc; +} +EXPORT_SYMBOL(class_notify_sptlrpc_conf); void obd_cleanup_caches(void) { @@ -549,7 +651,7 @@ int obd_init_caches(void) LASSERT(obd_device_cachep == NULL); obd_device_cachep = cfs_mem_cache_create("ll_obd_dev_cache", - sizeof(struct obd_device), + sizeof(struct obd_device), 0, 0); if (!obd_device_cachep) GOTO(out, -ENOMEM); @@ -600,6 +702,7 @@ struct obd_export *class_conn2export(struct lustre_handle *conn) export = class_handle2object(conn->cookie); RETURN(export); } +EXPORT_SYMBOL(class_conn2export); struct obd_device *class_exp2obd(struct obd_export *exp) { @@ -607,6 +710,7 @@ struct obd_device *class_exp2obd(struct obd_export *exp) return exp->exp_obd; return NULL; } +EXPORT_SYMBOL(class_exp2obd); struct obd_device *class_conn2obd(struct lustre_handle *conn) { @@ -619,6 +723,7 @@ struct obd_device *class_conn2obd(struct lustre_handle *conn) } return NULL; } +EXPORT_SYMBOL(class_conn2obd); struct obd_import *class_exp2cliimp(struct obd_export *exp) { @@ -627,6 +732,7 @@ struct obd_import *class_exp2cliimp(struct obd_export *exp) return NULL; return obd->u.cli.cl_import; } +EXPORT_SYMBOL(class_exp2cliimp); struct obd_import *class_conn2cliimp(struct lustre_handle *conn) { @@ -635,55 +741,74 @@ struct obd_import *class_conn2cliimp(struct lustre_handle *conn) return NULL; return obd->u.cli.cl_import; } +EXPORT_SYMBOL(class_conn2cliimp); /* Export management functions */ -static void export_handle_addref(void *export) -{ - class_export_get(export); -} - -void __class_export_put(struct obd_export *exp) -{ - if (atomic_dec_and_test(&exp->exp_refcount)) { - LASSERT (list_empty(&exp->exp_obd_chain)); - - CDEBUG(D_IOCTL, "final put %p/%s\n", - exp, exp->exp_client_uuid.uuid); - - spin_lock(&obd_zombie_impexp_lock); - list_add(&exp->exp_obd_chain, &obd_zombie_exports); - spin_unlock(&obd_zombie_impexp_lock); - - if (obd_zombie_impexp_notify != NULL) - obd_zombie_impexp_notify(); - } -} -EXPORT_SYMBOL(__class_export_put); - -void class_export_destroy(struct obd_export *exp) +static void class_export_destroy(struct obd_export *exp) { struct obd_device *obd = exp->exp_obd; ENTRY; - LASSERT (atomic_read(&exp->exp_refcount) == 0); + LASSERT_ATOMIC_ZERO(&exp->exp_refcount); + LASSERT(obd != NULL); CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp, exp->exp_client_uuid.uuid, obd->obd_name); - LASSERT(obd != NULL); - /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */ if (exp->exp_connection) ptlrpc_put_connection_superhack(exp->exp_connection); - LASSERT(list_empty(&exp->exp_outstanding_replies)); + LASSERT(cfs_list_empty(&exp->exp_outstanding_replies)); + LASSERT(cfs_list_empty(&exp->exp_uncommitted_replies)); + LASSERT(cfs_list_empty(&exp->exp_req_replay_queue)); + LASSERT(cfs_list_empty(&exp->exp_hp_rpcs)); obd_destroy_export(exp); - + class_decref(obd, "export", exp); + OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle); - class_decref(obd); EXIT; } +static void export_handle_addref(void *export) +{ + class_export_get(export); +} + +static struct portals_handle_ops export_handle_ops = { + .hop_addref = export_handle_addref, + .hop_free = NULL, +}; + +struct obd_export *class_export_get(struct obd_export *exp) +{ + cfs_atomic_inc(&exp->exp_refcount); + CDEBUG(D_INFO, "GETting export %p : new refcount %d\n", exp, + cfs_atomic_read(&exp->exp_refcount)); + return exp; +} +EXPORT_SYMBOL(class_export_get); + +void class_export_put(struct obd_export *exp) +{ + LASSERT(exp != NULL); + LASSERT_ATOMIC_GT_LT(&exp->exp_refcount, 0, LI_POISON); + CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp, + cfs_atomic_read(&exp->exp_refcount) - 1); + + if (cfs_atomic_dec_and_test(&exp->exp_refcount)) { + LASSERT(!cfs_list_empty(&exp->exp_obd_chain)); + CDEBUG(D_IOCTL, "final put %p/%s\n", + exp, exp->exp_client_uuid.uuid); + + /* release nid stat refererence */ + lprocfs_exp_cleanup(exp); + + obd_zombie_export_add(exp); + } +} +EXPORT_SYMBOL(class_export_put); + /* Creates a new export, adds it to the hash table, and returns a * pointer to it. The refcount is 2: one for the hash reference, and * one for the pointer returned by this function. */ @@ -691,148 +816,194 @@ struct obd_export *class_new_export(struct obd_device *obd, struct obd_uuid *cluuid) { struct obd_export *export; + cfs_hash_t *hash = NULL; int rc = 0; + ENTRY; OBD_ALLOC_PTR(export); if (!export) return ERR_PTR(-ENOMEM); export->exp_conn_cnt = 0; - atomic_set(&export->exp_refcount, 2); - atomic_set(&export->exp_rpc_count, 0); - export->exp_obd = obd; - CFS_INIT_LIST_HEAD(&export->exp_outstanding_replies); - /* XXX this should be in LDLM init */ - CFS_INIT_LIST_HEAD(&export->exp_ldlm_data.led_held_locks); - spin_lock_init(&export->exp_ldlm_data.led_lock); - - CFS_INIT_LIST_HEAD(&export->exp_handle.h_link); - class_handle_hash(&export->exp_handle, export_handle_addref); - export->exp_last_request_time = CURRENT_SECONDS; - spin_lock_init(&export->exp_lock); - INIT_HLIST_NODE(&export->exp_uuid_hash); - INIT_HLIST_NODE(&export->exp_nid_hash); - - export->exp_sp_peer = LUSTRE_SP_ANY; - export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID; - export->exp_client_uuid = *cluuid; - obd_init_export(export); - - spin_lock(&obd->obd_dev_lock); + export->exp_lock_hash = NULL; + export->exp_flock_hash = NULL; + cfs_atomic_set(&export->exp_refcount, 2); + cfs_atomic_set(&export->exp_rpc_count, 0); + cfs_atomic_set(&export->exp_cb_count, 0); + cfs_atomic_set(&export->exp_locks_count, 0); +#if LUSTRE_TRACKS_LOCK_EXP_REFS + CFS_INIT_LIST_HEAD(&export->exp_locks_list); + spin_lock_init(&export->exp_locks_list_guard); +#endif + cfs_atomic_set(&export->exp_replay_count, 0); + export->exp_obd = obd; + CFS_INIT_LIST_HEAD(&export->exp_outstanding_replies); + spin_lock_init(&export->exp_uncommitted_replies_lock); + CFS_INIT_LIST_HEAD(&export->exp_uncommitted_replies); + CFS_INIT_LIST_HEAD(&export->exp_req_replay_queue); + CFS_INIT_LIST_HEAD(&export->exp_handle.h_link); + CFS_INIT_LIST_HEAD(&export->exp_hp_rpcs); + class_handle_hash(&export->exp_handle, &export_handle_ops); + export->exp_last_request_time = cfs_time_current_sec(); + spin_lock_init(&export->exp_lock); + spin_lock_init(&export->exp_rpc_lock); + CFS_INIT_HLIST_NODE(&export->exp_uuid_hash); + CFS_INIT_HLIST_NODE(&export->exp_nid_hash); + spin_lock_init(&export->exp_bl_list_lock); + CFS_INIT_LIST_HEAD(&export->exp_bl_list); + + export->exp_sp_peer = LUSTRE_SP_ANY; + export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID; + export->exp_client_uuid = *cluuid; + obd_init_export(export); + + spin_lock(&obd->obd_dev_lock); + /* shouldn't happen, but might race */ + if (obd->obd_stopping) + GOTO(exit_unlock, rc = -ENODEV); + + hash = cfs_hash_getref(obd->obd_uuid_hash); + if (hash == NULL) + GOTO(exit_unlock, rc = -ENODEV); + spin_unlock(&obd->obd_dev_lock); + if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) { - rc = lustre_hash_additem_unique(obd->obd_uuid_hash_body, cluuid, - &export->exp_uuid_hash); - if (rc != 0) { - CWARN("%s: denying duplicate export for %s\n", - obd->obd_name, cluuid->uuid); - spin_unlock(&obd->obd_dev_lock); - class_handle_unhash(&export->exp_handle); - OBD_FREE_PTR(export); - return ERR_PTR(-EALREADY); - } + rc = cfs_hash_add_unique(hash, cluuid, &export->exp_uuid_hash); + if (rc != 0) { + LCONSOLE_WARN("%s: denying duplicate export for %s, %d\n", + obd->obd_name, cluuid->uuid, rc); + GOTO(exit_err, rc = -EALREADY); + } } - LASSERT(!obd->obd_stopping); /* shouldn't happen, but might race */ - class_incref(obd); - list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports); - list_add_tail(&export->exp_obd_chain_timed, - &export->exp_obd->obd_exports_timed); - export->exp_obd->obd_num_exports++; - spin_unlock(&obd->obd_dev_lock); + spin_lock(&obd->obd_dev_lock); + if (obd->obd_stopping) { + cfs_hash_del(hash, cluuid, &export->exp_uuid_hash); + GOTO(exit_unlock, rc = -ENODEV); + } - return export; + class_incref(obd, "export", export); + cfs_list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports); + cfs_list_add_tail(&export->exp_obd_chain_timed, + &export->exp_obd->obd_exports_timed); + export->exp_obd->obd_num_exports++; + spin_unlock(&obd->obd_dev_lock); + cfs_hash_putref(hash); + RETURN(export); + +exit_unlock: + spin_unlock(&obd->obd_dev_lock); +exit_err: + if (hash) + cfs_hash_putref(hash); + class_handle_unhash(&export->exp_handle); + LASSERT(cfs_hlist_unhashed(&export->exp_uuid_hash)); + obd_destroy_export(export); + OBD_FREE_PTR(export); + return ERR_PTR(rc); } EXPORT_SYMBOL(class_new_export); void class_unlink_export(struct obd_export *exp) { - class_handle_unhash(&exp->exp_handle); + class_handle_unhash(&exp->exp_handle); + + spin_lock(&exp->exp_obd->obd_dev_lock); + /* delete an uuid-export hashitem from hashtables */ + if (!cfs_hlist_unhashed(&exp->exp_uuid_hash)) + cfs_hash_del(exp->exp_obd->obd_uuid_hash, + &exp->exp_client_uuid, + &exp->exp_uuid_hash); + + cfs_list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports); + cfs_list_del_init(&exp->exp_obd_chain_timed); + exp->exp_obd->obd_num_exports--; + spin_unlock(&exp->exp_obd->obd_dev_lock); + class_export_put(exp); +} +EXPORT_SYMBOL(class_unlink_export); + +/* Import management functions */ +void class_import_destroy(struct obd_import *imp) +{ + ENTRY; + + CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp, + imp->imp_obd->obd_name); + + LASSERT_ATOMIC_ZERO(&imp->imp_refcount); - spin_lock(&exp->exp_obd->obd_dev_lock); - /* delete an uuid-export hashitem from hashtables */ - if (!hlist_unhashed(&exp->exp_uuid_hash)) { - lustre_hash_delitem(exp->exp_obd->obd_uuid_hash_body, - &exp->exp_client_uuid, &exp->exp_uuid_hash); + ptlrpc_put_connection_superhack(imp->imp_connection); + + while (!cfs_list_empty(&imp->imp_conn_list)) { + struct obd_import_conn *imp_conn; + + imp_conn = cfs_list_entry(imp->imp_conn_list.next, + struct obd_import_conn, oic_item); + cfs_list_del_init(&imp_conn->oic_item); + ptlrpc_put_connection_superhack(imp_conn->oic_conn); + OBD_FREE(imp_conn, sizeof(*imp_conn)); } - list_del_init(&exp->exp_obd_chain); - list_del_init(&exp->exp_obd_chain_timed); - exp->exp_obd->obd_num_exports--; - spin_unlock(&exp->exp_obd->obd_dev_lock); - class_export_put(exp); + LASSERT(imp->imp_sec == NULL); + class_decref(imp->imp_obd, "import", imp); + OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle); + EXIT; } -EXPORT_SYMBOL(class_unlink_export); -/* Import management functions */ static void import_handle_addref(void *import) { class_import_get(import); } +static struct portals_handle_ops import_handle_ops = { + .hop_addref = import_handle_addref, + .hop_free = NULL, +}; + struct obd_import *class_import_get(struct obd_import *import) { - LASSERT(atomic_read(&import->imp_refcount) >= 0); - LASSERT(atomic_read(&import->imp_refcount) < 0x5a5a5a); - atomic_inc(&import->imp_refcount); - CDEBUG(D_INFO, "import %p refcount=%d\n", import, - atomic_read(&import->imp_refcount)); + cfs_atomic_inc(&import->imp_refcount); + CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import, + cfs_atomic_read(&import->imp_refcount), + import->imp_obd->obd_name); return import; } EXPORT_SYMBOL(class_import_get); -void class_import_put(struct obd_import *import) +void class_import_put(struct obd_import *imp) { ENTRY; - CDEBUG(D_INFO, "import %p refcount=%d\n", import, - atomic_read(&import->imp_refcount) - 1); - - LASSERT(atomic_read(&import->imp_refcount) > 0); - LASSERT(atomic_read(&import->imp_refcount) < 0x5a5a5a); - LASSERT(list_empty(&import->imp_zombie_chain)); + LASSERT(cfs_list_empty(&imp->imp_zombie_chain)); + LASSERT_ATOMIC_GT_LT(&imp->imp_refcount, 0, LI_POISON); - if (atomic_dec_and_test(&import->imp_refcount)) { + CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp, + cfs_atomic_read(&imp->imp_refcount) - 1, + imp->imp_obd->obd_name); - CDEBUG(D_INFO, "final put import %p\n", import); - - spin_lock(&obd_zombie_impexp_lock); - list_add(&import->imp_zombie_chain, &obd_zombie_imports); - spin_unlock(&obd_zombie_impexp_lock); - - if (obd_zombie_impexp_notify != NULL) - obd_zombie_impexp_notify(); + if (cfs_atomic_dec_and_test(&imp->imp_refcount)) { + CDEBUG(D_INFO, "final put import %p\n", imp); + obd_zombie_import_add(imp); } - EXIT; + /* catch possible import put race */ + LASSERT_ATOMIC_GE_LT(&imp->imp_refcount, 0, LI_POISON); + EXIT; } +EXPORT_SYMBOL(class_import_put); -void class_import_destroy(struct obd_import *import) -{ - ENTRY; - - CDEBUG(D_IOCTL, "destroying import %p for %s\n", import, - import->imp_obd->obd_name); - - LASSERT(atomic_read(&import->imp_refcount) == 0); - - ptlrpc_put_connection_superhack(import->imp_connection); - - while (!list_empty(&import->imp_conn_list)) { - struct obd_import_conn *imp_conn; - - imp_conn = list_entry(import->imp_conn_list.next, - struct obd_import_conn, oic_item); - list_del(&imp_conn->oic_item); - ptlrpc_put_connection_superhack(imp_conn->oic_conn); - OBD_FREE(imp_conn, sizeof(*imp_conn)); +static void init_imp_at(struct imp_at *at) { + int i; + at_init(&at->iat_net_latency, 0, 0); + for (i = 0; i < IMP_AT_MAX_PORTALS; i++) { + /* max service estimates are tracked on the server side, so + don't use the AT history here, just use the last reported + val. (But keep hist for proc histogram, worst_ever) */ + at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT, + AT_FLG_NOHIST); } - - LASSERT(import->imp_sec == NULL); - class_decref(import->imp_obd); - OBD_FREE_RCU(import, sizeof(*import), &import->imp_handle); - EXIT; } -EXPORT_SYMBOL(class_import_put); struct obd_import *class_new_import(struct obd_device *obd) { @@ -846,24 +1017,26 @@ struct obd_import *class_new_import(struct obd_device *obd) CFS_INIT_LIST_HEAD(&imp->imp_replay_list); CFS_INIT_LIST_HEAD(&imp->imp_sending_list); CFS_INIT_LIST_HEAD(&imp->imp_delayed_list); - spin_lock_init(&imp->imp_lock); - imp->imp_last_success_conn = 0; - imp->imp_state = LUSTRE_IMP_NEW; - imp->imp_obd = class_incref(obd); - sema_init(&imp->imp_sec_mutex, 1); + spin_lock_init(&imp->imp_lock); + imp->imp_last_success_conn = 0; + imp->imp_state = LUSTRE_IMP_NEW; + imp->imp_obd = class_incref(obd, "import", imp); + mutex_init(&imp->imp_sec_mutex); cfs_waitq_init(&imp->imp_recovery_waitq); - atomic_set(&imp->imp_refcount, 2); - atomic_set(&imp->imp_inflight, 0); - atomic_set(&imp->imp_replay_inflight, 0); - atomic_set(&imp->imp_inval_count, 0); + cfs_atomic_set(&imp->imp_refcount, 2); + cfs_atomic_set(&imp->imp_unregistering, 0); + cfs_atomic_set(&imp->imp_inflight, 0); + cfs_atomic_set(&imp->imp_replay_inflight, 0); + cfs_atomic_set(&imp->imp_inval_count, 0); CFS_INIT_LIST_HEAD(&imp->imp_conn_list); CFS_INIT_LIST_HEAD(&imp->imp_handle.h_link); - class_handle_hash(&imp->imp_handle, import_handle_addref); + class_handle_hash(&imp->imp_handle, &import_handle_ops); + init_imp_at(&imp->imp_at); - /* the default magic is V1, will be used in connect RPC, and + /* the default magic is V2, will be used in connect RPC, and * then adjusted according to the flags in request/reply. */ - imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V1; + imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2; return imp; } @@ -871,18 +1044,61 @@ EXPORT_SYMBOL(class_new_import); void class_destroy_import(struct obd_import *import) { - LASSERT(import != NULL); - LASSERT(import != LP_POISON); + LASSERT(import != NULL); + LASSERT(import != LP_POISON); - class_handle_unhash(&import->imp_handle); + class_handle_unhash(&import->imp_handle); - spin_lock(&import->imp_lock); - import->imp_generation++; - spin_unlock(&import->imp_lock); - class_import_put(import); + spin_lock(&import->imp_lock); + import->imp_generation++; + spin_unlock(&import->imp_lock); + class_import_put(import); } EXPORT_SYMBOL(class_destroy_import); +#if LUSTRE_TRACKS_LOCK_EXP_REFS + +void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock) +{ + spin_lock(&exp->exp_locks_list_guard); + + LASSERT(lock->l_exp_refs_nr >= 0); + + if (lock->l_exp_refs_target != NULL && + lock->l_exp_refs_target != exp) { + LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n", + exp, lock, lock->l_exp_refs_target); + } + if ((lock->l_exp_refs_nr ++) == 0) { + cfs_list_add(&lock->l_exp_refs_link, &exp->exp_locks_list); + lock->l_exp_refs_target = exp; + } + CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n", + lock, exp, lock->l_exp_refs_nr); + spin_unlock(&exp->exp_locks_list_guard); +} +EXPORT_SYMBOL(__class_export_add_lock_ref); + +void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock) +{ + spin_lock(&exp->exp_locks_list_guard); + LASSERT(lock->l_exp_refs_nr > 0); + if (lock->l_exp_refs_target != exp) { + LCONSOLE_WARN("lock %p, " + "mismatching export pointers: %p, %p\n", + lock, lock->l_exp_refs_target, exp); + } + if (-- lock->l_exp_refs_nr == 0) { + cfs_list_del_init(&lock->l_exp_refs_link); + lock->l_exp_refs_target = NULL; + } + CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n", + lock, exp, lock->l_exp_refs_nr); + spin_unlock(&exp->exp_locks_list_guard); +} +EXPORT_SYMBOL(__class_export_del_lock_ref); +#endif + /* A connection defines an export context in which preallocation can be managed. This releases the export pointer reference, and returns the export handle, so the export refcount is 1 when this function @@ -912,90 +1128,123 @@ EXPORT_SYMBOL(class_connect); /* if export is involved in recovery then clean up related things */ void class_export_recovery_cleanup(struct obd_export *exp) { - struct obd_device *obd = exp->exp_obd; - - spin_lock_bh(&obd->obd_processing_task_lock); - if (obd->obd_recovering && exp->exp_in_recovery) { - spin_lock(&exp->exp_lock); - exp->exp_in_recovery = 0; - spin_unlock(&exp->exp_lock); - obd->obd_connected_clients--; - /* each connected client is counted as recoverable */ - obd->obd_recoverable_clients--; - if (exp->exp_req_replay_needed) { - spin_lock(&exp->exp_lock); - exp->exp_req_replay_needed = 0; - spin_unlock(&exp->exp_lock); - LASSERT(atomic_read(&obd->obd_req_replay_clients)); - atomic_dec(&obd->obd_req_replay_clients); - } - if (exp->exp_lock_replay_needed) { - spin_lock(&exp->exp_lock); - exp->exp_lock_replay_needed = 0; - spin_unlock(&exp->exp_lock); - LASSERT(atomic_read(&obd->obd_lock_replay_clients)); - atomic_dec(&obd->obd_lock_replay_clients); - } - } - spin_unlock_bh(&obd->obd_processing_task_lock); + struct obd_device *obd = exp->exp_obd; + + spin_lock(&obd->obd_recovery_task_lock); + if (exp->exp_delayed) + obd->obd_delayed_clients--; + if (obd->obd_recovering) { + if (exp->exp_in_recovery) { + spin_lock(&exp->exp_lock); + exp->exp_in_recovery = 0; + spin_unlock(&exp->exp_lock); + LASSERT_ATOMIC_POS(&obd->obd_connected_clients); + cfs_atomic_dec(&obd->obd_connected_clients); + } + + /* if called during recovery then should update + * obd_stale_clients counter, + * lightweight exports are not counted */ + if (exp->exp_failed && + (exp->exp_connect_flags & OBD_CONNECT_LIGHTWEIGHT) == 0) + exp->exp_obd->obd_stale_clients++; + } + spin_unlock(&obd->obd_recovery_task_lock); + /** Cleanup req replay fields */ + if (exp->exp_req_replay_needed) { + spin_lock(&exp->exp_lock); + exp->exp_req_replay_needed = 0; + spin_unlock(&exp->exp_lock); + LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients)); + cfs_atomic_dec(&obd->obd_req_replay_clients); + } + /** Cleanup lock replay data */ + if (exp->exp_lock_replay_needed) { + spin_lock(&exp->exp_lock); + exp->exp_lock_replay_needed = 0; + spin_unlock(&exp->exp_lock); + LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients)); + cfs_atomic_dec(&obd->obd_lock_replay_clients); + } } -/* This function removes two references from the export: one for the - * hash entry and one for the export pointer passed in. The export - * pointer passed to this function is destroyed should not be used - * again. */ +/* This function removes 1-3 references from the export: + * 1 - for export pointer passed + * and if disconnect really need + * 2 - removing from hash + * 3 - in client_unlink_export + * The export pointer passed to this function can destroyed */ int class_disconnect(struct obd_export *export) { int already_disconnected; ENTRY; if (export == NULL) { - fixme(); - CDEBUG(D_IOCTL, "attempting to free NULL export %p\n", export); + CWARN("attempting to free NULL export %p\n", export); RETURN(-EINVAL); } - spin_lock(&export->exp_lock); - already_disconnected = export->exp_disconnected; - export->exp_disconnected = 1; - - if (!hlist_unhashed(&export->exp_nid_hash)) { - lustre_hash_delitem(export->exp_obd->obd_nid_hash_body, - &export->exp_connection->c_peer.nid, &export->exp_nid_hash); - } - spin_unlock(&export->exp_lock); + spin_lock(&export->exp_lock); + already_disconnected = export->exp_disconnected; + export->exp_disconnected = 1; + spin_unlock(&export->exp_lock); /* class_cleanup(), abort_recovery(), and class_fail_export() * all end up in here, and if any of them race we shouldn't * call extra class_export_puts(). */ - if (already_disconnected) - RETURN(0); + if (already_disconnected) { + LASSERT(cfs_hlist_unhashed(&export->exp_nid_hash)); + GOTO(no_disconn, already_disconnected); + } CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n", export->exp_handle.h_cookie); + if (!cfs_hlist_unhashed(&export->exp_nid_hash)) + cfs_hash_del(export->exp_obd->obd_nid_hash, + &export->exp_connection->c_peer.nid, + &export->exp_nid_hash); + class_export_recovery_cleanup(export); class_unlink_export(export); +no_disconn: class_export_put(export); RETURN(0); } +EXPORT_SYMBOL(class_disconnect); -static void class_disconnect_export_list(struct list_head *list, int flags) +/* Return non-zero for a fully connected export */ +int class_connected_export(struct obd_export *exp) +{ + if (exp) { + int connected; + spin_lock(&exp->exp_lock); + connected = (exp->exp_conn_cnt > 0); + spin_unlock(&exp->exp_lock); + return connected; + } + return 0; +} +EXPORT_SYMBOL(class_connected_export); + +static void class_disconnect_export_list(cfs_list_t *list, + enum obd_option flags) { int rc; - struct lustre_handle fake_conn; - struct obd_export *fake_exp, *exp; + struct obd_export *exp; ENTRY; /* It's possible that an export may disconnect itself, but * nothing else will be added to this list. */ - while (!list_empty(list)) { - exp = list_entry(list->next, struct obd_export, exp_obd_chain); + while (!cfs_list_empty(list)) { + exp = cfs_list_entry(list->next, struct obd_export, + exp_obd_chain); + /* need for safe call CDEBUG after obd_disconnect */ class_export_get(exp); - spin_lock(&exp->exp_lock); - exp->exp_flags = flags; - spin_unlock(&exp->exp_lock); + spin_lock(&exp->exp_lock); + exp->exp_flags = flags; + spin_unlock(&exp->exp_lock); if (obd_uuid_equals(&exp->exp_client_uuid, &exp->exp_obd->obd_uuid)) { @@ -1004,52 +1253,43 @@ static void class_disconnect_export_list(struct list_head *list, int flags) exp); /* Need to delete this now so we don't end up pointing * to work_list later when this export is cleaned up. */ - list_del_init(&exp->exp_obd_chain); + cfs_list_del_init(&exp->exp_obd_chain); class_export_put(exp); continue; } - fake_conn.cookie = exp->exp_handle.h_cookie; - fake_exp = class_conn2export(&fake_conn); - if (!fake_exp) { - class_export_put(exp); - continue; - } - - spin_lock(&fake_exp->exp_lock); - fake_exp->exp_flags = flags; - spin_unlock(&fake_exp->exp_lock); - - rc = obd_disconnect(fake_exp); + class_export_get(exp); + CDEBUG(D_HA, "%s: disconnecting export at %s (%p), " + "last request at "CFS_TIME_T"\n", + exp->exp_obd->obd_name, obd_export_nid2str(exp), + exp, exp->exp_last_request_time); + /* release one export reference anyway */ + rc = obd_disconnect(exp); + + CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n", + obd_export_nid2str(exp), exp, rc); class_export_put(exp); - CDEBUG(D_HA, "disconnecting export %s (%p): rc %d\n", - exp->exp_client_uuid.uuid, exp, rc); } EXIT; } -static inline int get_exp_flags_from_obd(struct obd_device *obd) -{ - return ((obd->obd_fail ? OBD_OPT_FAILOVER : 0) | - (obd->obd_force ? OBD_OPT_FORCE : 0)); -} - void class_disconnect_exports(struct obd_device *obd) { - struct list_head work_list; - ENTRY; + cfs_list_t work_list; + ENTRY; + + /* Move all of the exports from obd_exports to a work list, en masse. */ + CFS_INIT_LIST_HEAD(&work_list); + spin_lock(&obd->obd_dev_lock); + cfs_list_splice_init(&obd->obd_exports, &work_list); + cfs_list_splice_init(&obd->obd_delayed_exports, &work_list); + spin_unlock(&obd->obd_dev_lock); - /* Move all of the exports from obd_exports to a work list, en masse. */ - spin_lock(&obd->obd_dev_lock); - list_add(&work_list, &obd->obd_exports); - list_del_init(&obd->obd_exports); - spin_unlock(&obd->obd_dev_lock); - - if (!list_empty(&work_list)) { + if (!cfs_list_empty(&work_list)) { CDEBUG(D_HA, "OBD device %d (%p) has exports, " "disconnecting them\n", obd->obd_minor, obd); - class_disconnect_export_list(&work_list, - get_exp_flags_from_obd(obd)); + class_disconnect_export_list(&work_list, + exp_flags_from_obd(obd)); } else CDEBUG(D_HA, "OBD device %d (%p) has no exports\n", obd->obd_minor, obd); @@ -1059,192 +1299,64 @@ EXPORT_SYMBOL(class_disconnect_exports); /* Remove exports that have not completed recovery. */ -int class_disconnect_stale_exports(struct obd_device *obd, - int (*test_export)(struct obd_export *)) +void class_disconnect_stale_exports(struct obd_device *obd, + int (*test_export)(struct obd_export *)) { - struct list_head work_list; - struct list_head *pos, *n; - struct obd_export *exp; - int cnt = 0; + cfs_list_t work_list; + struct obd_export *exp, *n; + int evicted = 0; ENTRY; CFS_INIT_LIST_HEAD(&work_list); - spin_lock(&obd->obd_dev_lock); - list_for_each_safe(pos, n, &obd->obd_exports) { - exp = list_entry(pos, struct obd_export, exp_obd_chain); - if (test_export(exp)) - continue; - - list_del(&exp->exp_obd_chain); - list_add(&exp->exp_obd_chain, &work_list); + spin_lock(&obd->obd_dev_lock); + cfs_list_for_each_entry_safe(exp, n, &obd->obd_exports, + exp_obd_chain) { /* don't count self-export as client */ if (obd_uuid_equals(&exp->exp_client_uuid, - &exp->exp_obd->obd_uuid)) + &exp->exp_obd->obd_uuid)) continue; - cnt++; - CDEBUG(D_ERROR, "%s: disconnect stale client %s@%s\n", + /* don't evict clients which have no slot in last_rcvd + * (e.g. lightweight connection) */ + if (exp->exp_target_data.ted_lr_idx == -1) + continue; + + spin_lock(&exp->exp_lock); + if (exp->exp_failed || test_export(exp)) { + spin_unlock(&exp->exp_lock); + continue; + } + exp->exp_failed = 1; + spin_unlock(&exp->exp_lock); + + cfs_list_move(&exp->exp_obd_chain, &work_list); + evicted++; + CDEBUG(D_HA, "%s: disconnect stale client %s@%s\n", obd->obd_name, exp->exp_client_uuid.uuid, exp->exp_connection == NULL ? "" : libcfs_nid2str(exp->exp_connection->c_peer.nid)); + print_export_data(exp, "EVICTING", 0); } - spin_unlock(&obd->obd_dev_lock); - - CDEBUG(D_ERROR, "%s: disconnecting %d stale clients\n", - obd->obd_name, cnt); - class_disconnect_export_list(&work_list, get_exp_flags_from_obd(obd)); - RETURN(cnt); -} -EXPORT_SYMBOL(class_disconnect_stale_exports); - -int oig_init(struct obd_io_group **oig_out) -{ - struct obd_io_group *oig; - ENTRY; - - OBD_ALLOC(oig, sizeof(*oig)); - if (oig == NULL) - RETURN(-ENOMEM); - - spin_lock_init(&oig->oig_lock); - oig->oig_rc = 0; - oig->oig_pending = 0; - atomic_set(&oig->oig_refcount, 1); - cfs_waitq_init(&oig->oig_waitq); - CFS_INIT_LIST_HEAD(&oig->oig_occ_list); - - *oig_out = oig; - RETURN(0); -}; -EXPORT_SYMBOL(oig_init); - -static inline void oig_grab(struct obd_io_group *oig) -{ - atomic_inc(&oig->oig_refcount); -} - -void oig_release(struct obd_io_group *oig) -{ - if (atomic_dec_and_test(&oig->oig_refcount)) - OBD_FREE(oig, sizeof(*oig)); -} -EXPORT_SYMBOL(oig_release); - -int oig_add_one(struct obd_io_group *oig, struct oig_callback_context *occ) -{ - int rc = 0; - CDEBUG(D_CACHE, "oig %p ready to roll\n", oig); - spin_lock(&oig->oig_lock); - if (oig->oig_rc) { - rc = oig->oig_rc; - } else { - oig->oig_pending++; - if (occ != NULL) - list_add_tail(&occ->occ_oig_item, &oig->oig_occ_list); - } - spin_unlock(&oig->oig_lock); - oig_grab(oig); - - return rc; -} -EXPORT_SYMBOL(oig_add_one); - -void oig_complete_one(struct obd_io_group *oig, - struct oig_callback_context *occ, int rc) -{ - cfs_waitq_t *wake = NULL; - int old_rc; - - spin_lock(&oig->oig_lock); - - if (occ != NULL) - list_del_init(&occ->occ_oig_item); - - old_rc = oig->oig_rc; - if (oig->oig_rc == 0 && rc != 0) - oig->oig_rc = rc; - - if (--oig->oig_pending <= 0) - wake = &oig->oig_waitq; - - spin_unlock(&oig->oig_lock); - - CDEBUG(D_CACHE, "oig %p completed, rc %d -> %d via %d, %d now " - "pending (racey)\n", oig, old_rc, oig->oig_rc, rc, - oig->oig_pending); - if (wake) - cfs_waitq_signal(wake); - oig_release(oig); -} -EXPORT_SYMBOL(oig_complete_one); - -static int oig_done(struct obd_io_group *oig) -{ - int rc = 0; - spin_lock(&oig->oig_lock); - if (oig->oig_pending <= 0) - rc = 1; - spin_unlock(&oig->oig_lock); - return rc; -} - -static void interrupted_oig(void *data) -{ - struct obd_io_group *oig = data; - struct oig_callback_context *occ; - - spin_lock(&oig->oig_lock); - /* We need to restart the processing each time we drop the lock, as - * it is possible other threads called oig_complete_one() to remove - * an entry elsewhere in the list while we dropped lock. We need to - * drop the lock because osc_ap_completion() calls oig_complete_one() - * which re-gets this lock ;-) as well as a lock ordering issue. */ -restart: - list_for_each_entry(occ, &oig->oig_occ_list, occ_oig_item) { - if (occ->interrupted) - continue; - occ->interrupted = 1; - spin_unlock(&oig->oig_lock); - occ->occ_interrupted(occ); - spin_lock(&oig->oig_lock); - goto restart; - } - spin_unlock(&oig->oig_lock); -} - -int oig_wait(struct obd_io_group *oig) -{ - struct l_wait_info lwi = LWI_INTR(interrupted_oig, oig); - int rc; - - CDEBUG(D_CACHE, "waiting for oig %p\n", oig); + spin_unlock(&obd->obd_dev_lock); - do { - rc = l_wait_event(oig->oig_waitq, oig_done(oig), &lwi); - LASSERTF(rc == 0 || rc == -EINTR, "rc: %d\n", rc); - /* we can't continue until the oig has emptied and stopped - * referencing state that the caller will free upon return */ - if (rc == -EINTR) - lwi = (struct l_wait_info){ 0, }; - } while (rc == -EINTR); + if (evicted) + LCONSOLE_WARN("%s: disconnecting %d stale clients\n", + obd->obd_name, evicted); - LASSERTF(oig->oig_pending == 0, - "exiting oig_wait(oig = %p) with %d pending\n", oig, - oig->oig_pending); - - CDEBUG(D_CACHE, "done waiting on oig %p rc %d\n", oig, oig->oig_rc); - return oig->oig_rc; + class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) | + OBD_OPT_ABORT_RECOV); + EXIT; } -EXPORT_SYMBOL(oig_wait); +EXPORT_SYMBOL(class_disconnect_stale_exports); void class_fail_export(struct obd_export *exp) { - int rc, already_failed; + int rc, already_failed; - spin_lock(&exp->exp_lock); - already_failed = exp->exp_failed; - exp->exp_failed = 1; - spin_unlock(&exp->exp_lock); + spin_lock(&exp->exp_lock); + already_failed = exp->exp_failed; + exp->exp_failed = 1; + spin_unlock(&exp->exp_lock); if (already_failed) { CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n", @@ -1258,6 +1370,9 @@ void class_fail_export(struct obd_export *exp) if (obd_dump_on_timeout) libcfs_debug_dumplog(); + /* need for safe call CDEBUG after obd_disconnect */ + class_export_get(exp); + /* Most callers into obd_disconnect are removing their own reference * (request, for example) in addition to the one from the hash table. * We don't have such a reference here, so make one. */ @@ -1268,6 +1383,7 @@ void class_fail_export(struct obd_export *exp) else CDEBUG(D_HA, "disconnected export %p/%s\n", exp, exp->exp_client_uuid.uuid); + class_export_put(exp); } EXPORT_SYMBOL(class_fail_export); @@ -1282,21 +1398,32 @@ EXPORT_SYMBOL(obd_export_nid2str); int obd_export_evict_by_nid(struct obd_device *obd, const char *nid) { - struct obd_export *doomed_exp = NULL; - int exports_evicted = 0; - - lnet_nid_t nid_key = libcfs_str2nid(nid); - - do { - doomed_exp = lustre_hash_get_object_by_key(obd->obd_nid_hash_body, - &nid_key); + cfs_hash_t *nid_hash; + struct obd_export *doomed_exp = NULL; + int exports_evicted = 0; + + lnet_nid_t nid_key = libcfs_str2nid((char *)nid); + + spin_lock(&obd->obd_dev_lock); + /* umount has run already, so evict thread should leave + * its task to umount thread now */ + if (obd->obd_stopping) { + spin_unlock(&obd->obd_dev_lock); + return exports_evicted; + } + nid_hash = obd->obd_nid_hash; + cfs_hash_getref(nid_hash); + spin_unlock(&obd->obd_dev_lock); + + do { + doomed_exp = cfs_hash_lookup(nid_hash, &nid_key); if (doomed_exp == NULL) break; LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key, "nid %s found, wanted nid %s, requested nid %s\n", obd_export_nid2str(doomed_exp), - libcfs_nid2str(nid_key), nid); + libcfs_nid2str(nid_key), nid); LASSERTF(doomed_exp != obd->obd_self_export, "self-export is hashed by NID?\n"); exports_evicted++; @@ -1307,6 +1434,8 @@ int obd_export_evict_by_nid(struct obd_device *obd, const char *nid) class_export_put(doomed_exp); } while (1); + cfs_hash_putref(nid_hash); + if (!exports_evicted) CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n", obd->obd_name, nid); @@ -1316,18 +1445,28 @@ EXPORT_SYMBOL(obd_export_evict_by_nid); int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid) { - struct obd_export *doomed_exp = NULL; - struct obd_uuid doomed; - int exports_evicted = 0; - - obd_str2uuid(&doomed, uuid); - if (obd_uuid_equals(&doomed, &obd->obd_uuid)) { + cfs_hash_t *uuid_hash; + struct obd_export *doomed_exp = NULL; + struct obd_uuid doomed_uuid; + int exports_evicted = 0; + + spin_lock(&obd->obd_dev_lock); + if (obd->obd_stopping) { + spin_unlock(&obd->obd_dev_lock); + return exports_evicted; + } + uuid_hash = obd->obd_uuid_hash; + cfs_hash_getref(uuid_hash); + spin_unlock(&obd->obd_dev_lock); + + obd_str2uuid(&doomed_uuid, uuid); + if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) { CERROR("%s: can't evict myself\n", obd->obd_name); + cfs_hash_putref(uuid_hash); return exports_evicted; } - doomed_exp = lustre_hash_get_object_by_key(obd->obd_uuid_hash_body, - &doomed); + doomed_exp = cfs_hash_lookup(uuid_hash, &doomed_uuid); if (doomed_exp == NULL) { CERROR("%s: can't disconnect %s: no exports found\n", @@ -1339,53 +1478,411 @@ int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid) class_export_put(doomed_exp); exports_evicted++; } + cfs_hash_putref(uuid_hash); return exports_evicted; } EXPORT_SYMBOL(obd_export_evict_by_uuid); -void obd_zombie_impexp_cull(void) +#if LUSTRE_TRACKS_LOCK_EXP_REFS +void (*class_export_dump_hook)(struct obd_export*) = NULL; +EXPORT_SYMBOL(class_export_dump_hook); +#endif + +static void print_export_data(struct obd_export *exp, const char *status, + int locks) { - struct obd_import *import; - struct obd_export *export; - ENTRY; - - do { - spin_lock (&obd_zombie_impexp_lock); + struct ptlrpc_reply_state *rs; + struct ptlrpc_reply_state *first_reply = NULL; + int nreplies = 0; + + spin_lock(&exp->exp_lock); + cfs_list_for_each_entry(rs, &exp->exp_outstanding_replies, + rs_exp_list) { + if (nreplies == 0) + first_reply = rs; + nreplies++; + } + spin_unlock(&exp->exp_lock); + + CDEBUG(D_HA, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: %p %s "LPU64"\n", + exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid, + obd_export_nid2str(exp), cfs_atomic_read(&exp->exp_refcount), + cfs_atomic_read(&exp->exp_rpc_count), + cfs_atomic_read(&exp->exp_cb_count), + cfs_atomic_read(&exp->exp_locks_count), + exp->exp_disconnected, exp->exp_delayed, exp->exp_failed, + nreplies, first_reply, nreplies > 3 ? "..." : "", + exp->exp_last_committed); +#if LUSTRE_TRACKS_LOCK_EXP_REFS + if (locks && class_export_dump_hook != NULL) + class_export_dump_hook(exp); +#endif +} + +void dump_exports(struct obd_device *obd, int locks) +{ + struct obd_export *exp; + + spin_lock(&obd->obd_dev_lock); + cfs_list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) + print_export_data(exp, "ACTIVE", locks); + cfs_list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain) + print_export_data(exp, "UNLINKED", locks); + cfs_list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain) + print_export_data(exp, "DELAYED", locks); + spin_unlock(&obd->obd_dev_lock); + spin_lock(&obd_zombie_impexp_lock); + cfs_list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain) + print_export_data(exp, "ZOMBIE", locks); + spin_unlock(&obd_zombie_impexp_lock); +} +EXPORT_SYMBOL(dump_exports); + +void obd_exports_barrier(struct obd_device *obd) +{ + int waited = 2; + LASSERT(cfs_list_empty(&obd->obd_exports)); + spin_lock(&obd->obd_dev_lock); + while (!cfs_list_empty(&obd->obd_unlinked_exports)) { + spin_unlock(&obd->obd_dev_lock); + cfs_schedule_timeout_and_set_state(CFS_TASK_UNINT, + cfs_time_seconds(waited)); + if (waited > 5 && IS_PO2(waited)) { + LCONSOLE_WARN("%s is waiting for obd_unlinked_exports " + "more than %d seconds. " + "The obd refcount = %d. Is it stuck?\n", + obd->obd_name, waited, + cfs_atomic_read(&obd->obd_refcount)); + dump_exports(obd, 1); + } + waited *= 2; + spin_lock(&obd->obd_dev_lock); + } + spin_unlock(&obd->obd_dev_lock); +} +EXPORT_SYMBOL(obd_exports_barrier); + +/* Total amount of zombies to be destroyed */ +static int zombies_count = 0; + +/** + * kill zombie imports and exports + */ +void obd_zombie_impexp_cull(void) +{ + struct obd_import *import; + struct obd_export *export; + ENTRY; + + do { + spin_lock(&obd_zombie_impexp_lock); import = NULL; - if (!list_empty(&obd_zombie_imports)) { - import = list_entry(obd_zombie_imports.next, - struct obd_import, - imp_zombie_chain); - list_del(&import->imp_zombie_chain); + if (!cfs_list_empty(&obd_zombie_imports)) { + import = cfs_list_entry(obd_zombie_imports.next, + struct obd_import, + imp_zombie_chain); + cfs_list_del_init(&import->imp_zombie_chain); } - + export = NULL; - if (!list_empty(&obd_zombie_exports)) { - export = list_entry(obd_zombie_exports.next, - struct obd_export, - exp_obd_chain); - list_del_init(&export->exp_obd_chain); + if (!cfs_list_empty(&obd_zombie_exports)) { + export = cfs_list_entry(obd_zombie_exports.next, + struct obd_export, + exp_obd_chain); + cfs_list_del_init(&export->exp_obd_chain); } - spin_unlock(&obd_zombie_impexp_lock); - - if (import != NULL) - class_import_destroy(import); + spin_unlock(&obd_zombie_impexp_lock); + + if (import != NULL) { + class_import_destroy(import); + spin_lock(&obd_zombie_impexp_lock); + zombies_count--; + spin_unlock(&obd_zombie_impexp_lock); + } + + if (export != NULL) { + class_export_destroy(export); + spin_lock(&obd_zombie_impexp_lock); + zombies_count--; + spin_unlock(&obd_zombie_impexp_lock); + } + + cfs_cond_resched(); + } while (import != NULL || export != NULL); + EXIT; +} - if (export != NULL) - class_export_destroy(export); +static struct completion obd_zombie_start; +static struct completion obd_zombie_stop; +static unsigned long obd_zombie_flags; +static cfs_waitq_t obd_zombie_waitq; +static pid_t obd_zombie_pid; - } while (import != NULL || export != NULL); - EXIT; +enum { + OBD_ZOMBIE_STOP = 0x0001, +}; + +/** + * check for work for kill zombie import/export thread. + */ +static int obd_zombie_impexp_check(void *arg) +{ + int rc; + + spin_lock(&obd_zombie_impexp_lock); + rc = (zombies_count == 0) && + !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags); + spin_unlock(&obd_zombie_impexp_lock); + + RETURN(rc); +} + +/** + * Add export to the obd_zombe thread and notify it. + */ +static void obd_zombie_export_add(struct obd_export *exp) { + spin_lock(&exp->exp_obd->obd_dev_lock); + LASSERT(!cfs_list_empty(&exp->exp_obd_chain)); + cfs_list_del_init(&exp->exp_obd_chain); + spin_unlock(&exp->exp_obd->obd_dev_lock); + spin_lock(&obd_zombie_impexp_lock); + zombies_count++; + cfs_list_add(&exp->exp_obd_chain, &obd_zombie_exports); + spin_unlock(&obd_zombie_impexp_lock); + + obd_zombie_impexp_notify(); +} + +/** + * Add import to the obd_zombe thread and notify it. + */ +static void obd_zombie_import_add(struct obd_import *imp) { + LASSERT(imp->imp_sec == NULL); + LASSERT(imp->imp_rq_pool == NULL); + spin_lock(&obd_zombie_impexp_lock); + LASSERT(cfs_list_empty(&imp->imp_zombie_chain)); + zombies_count++; + cfs_list_add(&imp->imp_zombie_chain, &obd_zombie_imports); + spin_unlock(&obd_zombie_impexp_lock); + + obd_zombie_impexp_notify(); +} + +/** + * notify import/export destroy thread about new zombie. + */ +static void obd_zombie_impexp_notify(void) +{ + /* + * Make sure obd_zomebie_impexp_thread get this notification. + * It is possible this signal only get by obd_zombie_barrier, and + * barrier gulps this notification and sleeps away and hangs ensues + */ + cfs_waitq_broadcast(&obd_zombie_waitq); +} + +/** + * check whether obd_zombie is idle + */ +static int obd_zombie_is_idle(void) +{ + int rc; + + LASSERT(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)); + spin_lock(&obd_zombie_impexp_lock); + rc = (zombies_count == 0); + spin_unlock(&obd_zombie_impexp_lock); + return rc; +} + +/** + * wait when obd_zombie import/export queues become empty + */ +void obd_zombie_barrier(void) +{ + struct l_wait_info lwi = { 0 }; + + if (obd_zombie_pid == cfs_curproc_pid()) + /* don't wait for myself */ + return; + l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi); } -EXPORT_SYMBOL(obd_zombie_impexp_cull); +EXPORT_SYMBOL(obd_zombie_barrier); + +#ifdef __KERNEL__ -void obd_zombie_impexp_init(void) +/** + * destroy zombie export/import thread. + */ +static int obd_zombie_impexp_thread(void *unused) { - INIT_LIST_HEAD(&obd_zombie_imports); - INIT_LIST_HEAD(&obd_zombie_exports); - spin_lock_init(&obd_zombie_impexp_lock); + int rc; + + rc = cfs_daemonize_ctxt("obd_zombid"); + if (rc != 0) { + complete(&obd_zombie_start); + RETURN(rc); + } + + complete(&obd_zombie_start); + + obd_zombie_pid = cfs_curproc_pid(); + + while (!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) { + struct l_wait_info lwi = { 0 }; + + l_wait_event(obd_zombie_waitq, + !obd_zombie_impexp_check(NULL), &lwi); + obd_zombie_impexp_cull(); + + /* + * Notify obd_zombie_barrier callers that queues + * may be empty. + */ + cfs_waitq_signal(&obd_zombie_waitq); + } + + complete(&obd_zombie_stop); + + RETURN(0); } +#else /* ! KERNEL */ + +static cfs_atomic_t zombie_recur = CFS_ATOMIC_INIT(0); +static void *obd_zombie_impexp_work_cb; +static void *obd_zombie_impexp_idle_cb; + +int obd_zombie_impexp_kill(void *arg) +{ + int rc = 0; + + if (cfs_atomic_inc_return(&zombie_recur) == 1) { + obd_zombie_impexp_cull(); + rc = 1; + } + cfs_atomic_dec(&zombie_recur); + return rc; +} + +#endif + +/** + * start destroy zombie import/export thread + */ +int obd_zombie_impexp_init(void) +{ + int rc; + + CFS_INIT_LIST_HEAD(&obd_zombie_imports); + CFS_INIT_LIST_HEAD(&obd_zombie_exports); + spin_lock_init(&obd_zombie_impexp_lock); + init_completion(&obd_zombie_start); + init_completion(&obd_zombie_stop); + cfs_waitq_init(&obd_zombie_waitq); + obd_zombie_pid = 0; + +#ifdef __KERNEL__ + rc = cfs_create_thread(obd_zombie_impexp_thread, NULL, 0); + if (rc < 0) + RETURN(rc); + + wait_for_completion(&obd_zombie_start); +#else + + obd_zombie_impexp_work_cb = + liblustre_register_wait_callback("obd_zombi_impexp_kill", + &obd_zombie_impexp_kill, NULL); + + obd_zombie_impexp_idle_cb = + liblustre_register_idle_callback("obd_zombi_impexp_check", + &obd_zombie_impexp_check, NULL); + rc = 0; +#endif + RETURN(rc); +} +/** + * stop destroy zombie import/export thread + */ +void obd_zombie_impexp_stop(void) +{ + set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags); + obd_zombie_impexp_notify(); +#ifdef __KERNEL__ + wait_for_completion(&obd_zombie_stop); +#else + liblustre_deregister_wait_callback(obd_zombie_impexp_work_cb); + liblustre_deregister_idle_callback(obd_zombie_impexp_idle_cb); +#endif +} + +/***** Kernel-userspace comm helpers *******/ + +/* Get length of entire message, including header */ +int kuc_len(int payload_len) +{ + return sizeof(struct kuc_hdr) + payload_len; +} +EXPORT_SYMBOL(kuc_len); + +/* Get a pointer to kuc header, given a ptr to the payload + * @param p Pointer to payload area + * @returns Pointer to kuc header + */ +struct kuc_hdr * kuc_ptr(void *p) +{ + struct kuc_hdr *lh = ((struct kuc_hdr *)p) - 1; + LASSERT(lh->kuc_magic == KUC_MAGIC); + return lh; +} +EXPORT_SYMBOL(kuc_ptr); + +/* Test if payload is part of kuc message + * @param p Pointer to payload area + * @returns boolean + */ +int kuc_ispayload(void *p) +{ + struct kuc_hdr *kh = ((struct kuc_hdr *)p) - 1; + + if (kh->kuc_magic == KUC_MAGIC) + return 1; + else + return 0; +} +EXPORT_SYMBOL(kuc_ispayload); + +/* Alloc space for a message, and fill in header + * @return Pointer to payload area + */ +void *kuc_alloc(int payload_len, int transport, int type) +{ + struct kuc_hdr *lh; + int len = kuc_len(payload_len); + + OBD_ALLOC(lh, len); + if (lh == NULL) + return ERR_PTR(-ENOMEM); + + lh->kuc_magic = KUC_MAGIC; + lh->kuc_transport = transport; + lh->kuc_msgtype = type; + lh->kuc_msglen = len; + + return (void *)(lh + 1); +} +EXPORT_SYMBOL(kuc_alloc); + +/* Takes pointer to payload area */ +inline void kuc_free(void *p, int payload_len) +{ + struct kuc_hdr *lh = kuc_ptr(p); + OBD_FREE(lh, kuc_len(payload_len)); +} +EXPORT_SYMBOL(kuc_free); + + +